Sim Racing Hardware Calibration and Linearity
Direct-drive and belt-driven racing wheels (Logitech, Thrustmaster, Fanatec, Moza) rely on linear optical encoders to measure steering input.
Specialized Diagnostic
Steering Wheel & Pedals Tester
Test racing wheel rotation angles (900°/1080°), pedal linearity (Throttle, Brake, Clutch), and H-pattern gear shifters online free.
Steering Rotation Angle
Pedal Linearity Bars
If your wheel uses pedals over a separate input, values stay at 0% until detected.
Racing Wheel Diagnostic Guidelines
Steering rotation should track smoothly from center (0°) to maximum lock-to-lock angle without deadzone gaps.
How to Get Started
Just three steps to run a complete controller test and understand your controller's health status.
01
Connect Controller
Connect your controller to your computer via USB cable or Bluetooth. If the browser doesn't respond, press any button on the controller to activate the connection.
02
Button Detection
Press each button in the visual interface and confirm the corresponding area lights up on screen. This helps troubleshoot unresponsive or double-clicking buttons.
03
Sticks & Vibration
Rotate the sticks to check linearity and drift issues; click the vibration test button to feel if the left and right motor feedback is working properly.
What would you like to do next?
Select a diagnostic calibration suite, deadzone analyzer, or high-frequency overclock tool.
Fix
Repair & Calibration
Calibrate zero-point offsets or follow step-by-step repair guides.
Optimize
Game Deadzones
Calculate exact radial vs axial deadzone overlays for Fortnite, Apex, & COD.
Telemetry
Overclock & Circularity
Verify true hardware polling Hz stability and statistical circularity grades.
Frequently Asked Questions
Everything you need to know about testing your controller.
How do I test my racing wheel rotation angle and pedals?
Connect your Logitech G29/G923, Thrustmaster T300RS, or Fanatec racing wheel to your computer via USB, turn the wheel left and right, and depress the throttle, brake, and clutch pedals.
Does this tool test 900-degree and 1080-degree rotation angles?
Yes! The visualizer tracks full 900° and 1080° steering lock-to-lock rotation angles in real time.
Can I test load cell brake pedals and H-pattern shifters?
Yes! Analog pedal travel linearity is measured from 0% to 100% full depression.
How this test works & its limits
- This test reads your controller through the browser's standard Gamepad API — no drivers, no installs, nothing leaves your device.
- Readings depend on connection mode: Bluetooth reports at lower rates than USB. Compare like-for-like (wired vs wired).
- We measure the input reaching the browser — display lag and game-engine queues are outside this test's view.
- A clean reading now does not guarantee no drift in-game: deadzones differ per game, and wear develops over time. Use the Drift Timeline to track yours.
- This is a diagnostic, not a hardware-lab certification. For repair or RMA decisions, confirm with a second run or second tool.
100% Client-Side
All Gamepad API data stays in your browser. Zero tracking or data collection.
Instant Results
No downloads, plugins, or software installation needed. Works instantly.
Free Forever
No paywalls, subscription requirements, or hidden usage limits.